Dental Amalgam Flashcards
Is amalgam a brittle material?
yes
Where is amalgam weakest?
tension
What happens if you increase gamma2?
weaker material
What happens to strength is you add high copper and spherical alloys?
higher early compressive and tensile strength
Since amalgam is a metal, what is the effect of thermal cycling?
microleakage
fracture tooth tissue
thermal trauma to pulp
How does the amalgam set?
crystal expansion
Why does crystal expansion occur?
because the gamma1 (silver/mercury) crystals expand by growth
What are the 3 choices of working time?
fast
regular
slow set
when would you use fast set?
same appointment cast preparation
When would you use silver amalgam?
class I and II cavities
cores for cast restoration
What is the minimum cavity depth for amalgam?
2mm
What is retention form?
resistance to displacement in an axial direction
What is resistance form?
resistance to displacement in any other direction (not axial)
How to remove amalgam?
cut a cross
How can you retain dental amalgam?
use adhesive (bonding) - conserve tooth tissue
What are the benefits of bonging?
increased retention
decreased microleakage
decreased pulpal trauma and inflammation
decreased post-operative sensitivity
decreased incidence of recurrent caries
decreased cuspal deflection
increased fracture resistance pf the tooth
bonding tooth segments together in the treatment of cracked cusp
What adhesives do we use?
resin based composite adhesive
- dual (probs this one)
- chemical cure
What is the dual cure resin based composite used in the IoD?
nexus 3 (kerr hawe)
